fix set_speed, allow for changing speed mid pattern

app.py

@@ -1023,7 +1023,7 @@ def set_speed():
             return jsonify({"success": False, "error": "Invalid speed value"}), 400
 
         # Send the SET_SPEED command to the Arduino
-        command = f"SET_SPEEzD {speed}"
+        command = f"SET_SPEED {speed}"
         send_command(command)
         return jsonify({"success": True, "speed": speed})
     except Exception as e:

firmware/arduino_code/arduino_code.ino

@@ -229,7 +229,6 @@ void appMode()
                     inOutStepper.setMaxSpeed(newSpeed);
 
                     Serial.println("SPEED_SET");  
-                    Serial.println("R");
                 }
                 else
                 {

firmware/arduino_code_TMC2209/arduino_code_TMC2209.ino

@@ -230,7 +230,6 @@ void appMode()
                     inOutStepper.setMaxSpeed(newSpeed);
 
                     Serial.println("SPEED_SET");  
-                    Serial.println("R");
                 }
                 else
                 {

firmware/esp32/esp32.ino

@@ -109,7 +109,6 @@ void loop()
                     inOutStepper.setMaxSpeed(newSpeed);
 
                     Serial.println("SPEED_SET");  
-                    Serial.println("R");
                 }
                 else
                 {